Automatic machine for grinding drills



Aug. 2, 1949. E. FOUQUET 2,477,730

AUTOMATIC MACHINE FOR GRINDING DRILLS Filed April 18. 1946 ll Sheets-Sheet 1 Fig.2 6 .9- 7' wig-M Aug. 2, 1949.

Filed April 18, 1946 E. FOUQUET 2,477,730

AUTOMATIC MACHINE FOR GRINDING DRILLS l1 Sheets-Sheet 2 Aug. 2, 1949. E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS l1 Sheets-Sheet 3 Filed April 18, 1946 Aug. 2, 1949. FOUQUET 2,477,730

I AUTOMATIC MACHINE FOR GRINDING DRILLS Filed April 18, 1946 11 Sheets-Sheet 4 Aug. 2, 1949.

Filed April 18, 1946 E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS 11 Sheets-Sheet 5 f f Z 7 fly! 77 9 H llll M4 li 17% E. FOUQU ET 2,477,730

AUTOMATIC MACHINE FOR GRINDING DRILLS ll Sheets-Sheet 6 Aug. 2, 1949.

Filed April 18, 1946 Aug. 2, 1949.

Filed April 18, 1946 E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS 11 Sheets-Sheet 8 Aug. 2, 1949..

E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS Filed April 18, 1946 11 sheets-sheet 9 L I I I I i l l l 4 M fw/ME Aug. 2, 1949. E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS ll Sheets-Sheet l0 iled April 18, 1946 Aug. 2, 1949. E. FOUQUET AUTOMATIC MACHINE FOR GRINDING DRILLS l1 Sheets-Sheet 11 Filed April 18, 1946 Patented Aug. 2, 1949 2,477,730 AuroMA'rIo MACHINE FOR onmnmo DRILL Eugene Fouquet, Bois-Colombes, France Application April is, 1946, Serial No. 663,010 In France July 28, 1941 18 Claims.

My invention relates to a method for producing, starting from a steel spindle or needle and in a single operation, boring drills; said method consists chiefly in cutting or recessing by means of a grindstone rotating at-a high speed at least one flute of the drill in a steel needle advancing in the direction of its longitudinal axis while rotating about said axis, the longitudinal displacement of the needles to be machined on one hand and the rotation of the grindstone on the other hand being executed with a sufilciently high speed for the steel shavings removed from a needle by the grindstone not to have time to communicate their heat to the mass of metal forming the needles.

By way of example I may mention that in the case of drills the diameters of which are 3 mm. and which are to be provided with flutes 50 mm. long, the time of reciprocation of the drill should not be above A of a second, the translation speed reaching up to one meter per second and the grindstone moving at a linear speed of at least 80 meters per second.

The automatic machine for producing the drills includes chiefly two grindstones one of which is intended for recessing the flutes and the other for the cutting or production of the fillets, said grindstone being associated with means for imparting to the steel needles a combined longitudinal and rotating movement with reference to each of the grindstones, ther'ecessing grindstone having its axis oblique with reference to the direction of displacement of the needles while the cutting grindstone has its axis parallel with said displacement.

Means may be provided for transferring automatically the drill from the zone of operation of the recessing grindstone into the zone of operation of the cutting grindstone. Preferably these means may be operative at the end of the feed stroke of the needles during which the flutes have been recessed while the cutting is produced during the return stroke of the needles.

Further features of the machine according to my invention will appear in the following description of a form of execution of a machine selected by Way of example and illustrated in accompanying drawings.

In said drawings:

Fig. 1 is a large scale view of a drill;

Fig. 2 is a cross-sectional view of said drill;

Figs. 3 and 4 are 'diagrammatical showings adapted to explain the general operation of the machine;

Fig. 5 is a plan view, partly cross-sectional. of the central portion of the machine;

Fig. 5a is a plan view, partly cross-sectional, of the right hand end of the machine;

Fig. 6 is a plan view oi the left hand end or the machine together with the grindstones and their controlling means.

Fig. '7 is a plan view of the right hand end of the machine with the device for introducing the needles;

Fig. 8 is a detail, on a larger scale, or a part of the machine comprising a sun-and-planet system and a shaft controlled by said system;

Fig. 9 is an elevatlonal view of the central part of the machine;

Fig. 10 is an elevational view of the left hand side of the machine with the grindstones;

Fig. 11 is an elevational view of the right hand side of the machine;

Figs. 12 and 12a form a rear view of the machine;

Fig. 13 is a detail view in longitudinal crosssection and at a larger scale of the clamping means and auxiliary members;

Fig. 14 is a transversal cross-section through line A-B of Fig. 13;

Fig. 15 is a detail view of a transmission gear;

Fig. 16 is a detail elevational view of the needle distributor of the machine.

Reverting to Figs. 1 and 2, they show a drill constituted by a cylindrical rod T wherein are cut the helical flutes G. There exists two such flutes at from one another. At the end of each flute in the direction of engagement of the drill there is provided a small rib or flllet L adapted to open the way for the drill in the material engaged thereby in order to avoid any friction between the wall of the bore being made and the surface of the drill.

According to my invention (Figs. 3 and 4), there are used two grindstones M, M rotating both around stationary axes. The first grindstone M is the so-called flute recessing grindstone and lies at a certain angle with reference to the axis of the cylindrical rod T. A needle adapted to be made into the form of a drill is introduced in front of said grindstone and rotates with reference thereto, while executing a longitudinal movement in the direction of the arrow Under these conditions and during the movement the flute is recessed through the action of the grindstone M.

The drill is then submitted as a whole to a bodily downward movement as illustrated by the arrow 9 and this displacement engages it with the so-called relieving grindstone M" the axis of which is parallel to that of the drill. Now if the drill is caused to advance from right to left as shown by the arrow )1, while rotating this combined movement is identical with and of opposite direction with reference to that executed by the drill for recessing the flutes and the grindstonc M provided with a suitable flat surface will wear off the parts located between the flutes so as to shape them into a cylindrical surface with the exception of the rib which remains then as a projecting rib on the drill.

Lastly the drill is returned into its upper position while it is caused to rotate through 180 round" its axis so that the second flute may be recessed during the next feed.

The machine according to my invention includes a base plate I carrying a frame 2. The frame carries in its turn two uprights 4 and 5 (Figs. 5 and 12); these two uprights form the bearings of a rocking cradle including a central hollow member 6 pivotally carried in said uprights 4 and 5 together with two horizontal beams 1 and 8 connected at their front end by the stationary cross-beam or head 9. This cross beam is rigid with a guiding sleeve The rear ends of the longitudinal beams 1 and 8 are connected through a further cross member l2 adapted to slide over them. This cross member I2 is provided with a bearing inside which may rotate without its being capable of moving longitudinally a hollow spindle l3 ending with a nosel4 screwed into same (Fig. 13). Inside said spindle may move a clamp l5 formed after the manner of all similarclamps by a plurality of segments adapted to cooperate with the nose i 4 (Fig. 14). This clamp I5 is rigidly secured through screwing with a clamp drawing member 6 fitted at its rear end inside a nut shaped pinion |1 adapted to be screwed into or to be unscrewed from the cross member l2. Obviously the rotation of the nut shaped pinion H has for its action to provide for the forward or the rearward movement of the clamp drawing member inside the spindle l3.

The clamp drawing member I6 is provided with an axial bore inside which advance the succession of needles or spindles of tempered steel l8, the forward needle of which is being machined so as to form the drill.

The nut-shaped pinion l1 receives its rotational movements in either direction through a gear I 9 keyed to a shaft 2| adapted to rotate without any longitudinal movement in the cross member l2. This gear I9 is rigid with a ribbed spindle 22 adapted to move freely in a longitudinal direction inside the fluted hub of a bevel pinion 23 and rotating in unison with said hub. The bevel pinion 23 meshes with another bevel pinion 24 housed inside a casing 25 secured to the longitudinal beam 8 (Fig. 5). The shaft 3| carrying the pinion 24 is rigid with a toothed plate 26 meshing with a toothed socket 21; said toothed socket is submitted to the action of a spring 26 hearing against a ring 29 secured to the shaft 3| of the pinion 24, which shaft is mounted in its turn inside the head of the connecting rod 32 adapted to rotate freely round the shaft of a motor 33 which is the motor controlling the opening and closing of the clamp. The shaft of said motor 33 carries on the other end a pinion 34 meshing with the gear wheel 35 rigid with the toothed socket 21'. It is apparent that the cooperatlon between the toothed socket 21 and the toothed plate 26 forms a stress limiting device, i. e. when the resistance opposed by the plate 26 is too high, the socket 21 rotates round the shaft 3| without driving the plate or the shaft 3|. The

mounting of the shaft 3| inside the connecting rod 32 allows the rocking of the cradle 6 and of 5 its longitudinal beams 1 and 6.

I will now describe the members providing for the helical displacements of the spindle l3 in order to allow the recessing of the gouges. A reproducing device 36 (Figs. 8 and 9) constituted by an externally threaded sleeve is rigid with the spindle l3. This threaded sleeve is slightly conical and ends at its front end into a cylindrical .part 31. Its threaded portion cooperates with a cylindrical nut 38 rigidly secured through the agency of a sleeve 39 to a flange 4| on a further sleeve 42 adapted to rotate inside the hollow central portion 6 of the cradle. The flange 4| carries moreover a projection 43 adapted to cooperate with two stops 44 and 45 secured respectively to the longitudinal beams 1 and 6 of the cradle. The cooperation between said projection 43 and the stops 44 and 45 limits to 180 the rotation of the flange 4| and consequently of the nut 36.

The sleeve 42 carrying at the end opposed to the flange 4| a bevel wheel 46 is fitted over another sleeve 41 capable of sliding without any rotation over the spindle l3 by reason of the presence of a key 46. Said sleeve 41 ends with a bevel wheel 49 coaxial with the bevel wheel 46.

The bevel wheel 49 meshes with the bevel wheel 5| secured to the end of a shaft 52 the other end of which is keyed to one of the sunwheels 53 of a sun-and-planet system the planet pinions 54 of which are carried inside a cage 55 rigid with a gear 56.

The bevel wheel 46 meshes with a bevel wheel 51 secured to its hollow shaft 56 adapted to rotate inside the central member 6 of the cradle. To said hollow shaft 58 is keyed a gear 59.

40 Furthermore the second sunwheel 6| of the sun-and-planet system is keyed to a shaft 62 rigid with a pinion 63. This shaft 62 is carried inside bearings forming part of an extension of the frame 2, as shown in Fig. 12. The pinion 63 engages a gear wheel 64 engaging in its turn a pinion 65 keyed to a shaft 66 adapted to rotate inside the bearing 61 secured to the frame. The axis 68 of the gear wheel 64 is capable of moving as shown in Fig. 9 inside its slideway 69 formed in a member 1| of a so-called swing frame provided with a collar 12 surrounding the shaft 66 and adapted to rotate round same. The member 1| shown in Fig. 9 has been illustrated separately in Fig. 15. It is provided with a slot 13 concentric with the shaft 66 and adapted to receive a securing screw 14 engaging the frame and allowing consequently said member 1| to be set in different angular positions with reference to the shaft 66. This arrangement allows changing the pinion 60 by suitably modifying the position of the axis 68 in its slideway 69 and the position of the swing frame 1| through a rotation thereof with reference to the screw 14.

The shaft 66 carries moreover a. pinion 15 (Fig.

66 12) projecting through an opening 16 of the frame. The pinion 15 is engaged by a. toothed sector 11 (Fig. 9) keyed to a. shaft 18 carried by the frame. A counterweight 19 balances the sector 11 as shown in Fig. 11. To the shaft 16 is 70 also keyed an arm 8| pivotally secured to a connecting rod 82. The latter is pivotally secured to the end of a crank 83 keyed to ashaft 84 carried in the frame and the other end of which is provided with a toothed wheel 85 (Fig. 12a.)

76 meshing with a pinion 86 to the axis 81 of which is keyed the wheel I! meshing with the pinion 39 keyed to the axis of the motor 9| which is the drill controlling motor.

The gear 59 meshes with the gear wheel 92 (Figs. 8 and 12) and the gear 55 meshes with the gear 93. both gears 92 and 93 being rigid with a common shaft 94 mounted in and passing through the frame. At its other end. the shaft 94 carries a gear wheel 95 engaging a pinion 96 keyed to the shaft of the motor 91 which latter is carried by a bracket 98 of the frame. Said motor 91 is the motor controlling the reversing of the drill (Fig. 12a).

As already disclosed. the bevel reproducing sleeve 33 ends under the form of a cylindrical ring 31 (Fig. 9) The member 36 and its ring are adapted to cooperate with a roller IIII carried inside a strap III2 the threaded tail-piece of which may be adjusted through suitable nuts with reference to the transversal member I93. Said transversal member I113 is pivotally secured on one hand at I34 to an upright I05 of the frame and is secured on the other hand through a bolt to the opposite upright I06 of the frame (Figs. 12 and 12a). vided moreover with stops IIlIl against which may bear the longitudinal beams 1 and 3 which are urged against same through the springs I91 acting on said longitudinal beams 1 and 3 of the cradle and bearing on the other hand against nuts I33 engaging screws I49 fitted in the frame. These stops .IIIt prevent the reproducer 35 or its ring 32 from engaging roughly the roller IOI when the cradle is being raised. They are located in a manner such that there is no complete contact between the reproducer and the roller in the raised cradle. The lowering of the cradle is provided through a cam III as shown in particular in Fig. 9, said cam acting on a bar II2 rigid with the transverse or head beam 9. Said cam III is keyed to a shaft II3 rotating inside the bearing III secured to the frame as shown in Fig. 5. The shaft M3 is provided with a gear wheel I I5 meshing with a pinion I It keyed to the end of the shaft of the motor II1 which is the cradle lowering motor and is carried by a support II3 secured to the frame (Fig. 9).

The distribution of the drills forming steel needles or spindles It is provided through a gravity distributor (Figs. 5, 11 and 16) constituted by two plates II9 and I2I between which the spindles or needles I3 are adapted to progress. The lowermost needle registers with the opening of the clamp drawing member It and it is urged into the channel formed inside said member by a piston I22 secured to the end of a slider I23 (Fig. 11) adapted to move inside a frame I24 and operatively engaged at its other end by a connecting rod I25 pivotally secured to a crank I25 (Fig. '1) carried by a plate keyed to the end of the shaft of the needle introducing motor I21. Said shaft is provided at its other end (Fig. 11) with a projection I22 adapted to cooperate with either side of a stop I29 secured to the frame I24. This frame I24 is carried in its turn together with the motor I21 on a slider I3I which it is possible to displace with reference to the frame of the machine through a nut and screw system actuated by a hand wheel I32.

Once they have engaged thechannel of the clamp drawing member It, the needles I8 (Fig. 13) move forward and push one another forwardly inside said channel. A spring urged hook I33 secured to the clamp drawing member prevents the latter from moving out of the channel.

The uprights I35 and I93 are pro- To the forward end of the clamp drawing member is threadedly connected as disclosed the clamp I5. Said clamp is constituted as known per se (Fig. 14) by a. certain number of segments which have a tendency to moving apart and which are urged together so as to fasten the foremost needle between them through the agency of the conical nose I4 secured through screwing to the end of spindle I3 when the clamp drawing member advances with reference to said spindle. On the'contrary when the clamp driving member recedes the needle is released. Care should be taken to avoid this release from being too rough and leading to an ejection of the needle. To this purpose I resort to the arrangement illustrated in Figs. 13 and 14. The clamp I5 is provided in its rear part with a slope I34 adapted to cooperate with the yielding segments I35, the tail ends of which are rigid with the conical nose I4 and consequently with the spindle I3. It is apparent that when the clamp I5 recedes its rear slope cooperatm with the ends of the segments I35, which ensures a certain fastening of the clamp and consequently a braking of the movement of the finished drill which is ejected only subsequently under the action of the progression of the next needle which enters its shaping position.

The grindstone M for recessin the flutes is keyed to a spindle I31 (Figs. 6 and 10) rotating inside a bearing I38 forming part of a slider I33 adapted to move vertically inside a frame I4I carried by a sector-shaped plate I42. Said plate I42 may rotate round an axis I43 passing through the point of engagement between the grindstone and the drill. Said plate is provided with screws I44 adapted to move inside a groove I45 the center of which is at I43 and which is formed on the base plate I of the machine. It is possible thereby to adjust the angular position of the grindstone M with reference to the axis of the drill. The grindstone M is started running through a pulley I46 keyed to the shaft I31 and connected through a belt I41 to a companion pulley I43, keyed to the shaft of the motor I49 pivotally secured to the frame I4I. Tensioning means I5I allow moving the pulleys I46 and I49 together or apart. On the other hand the vertical movements of the slider I39 with reference to the frame I4I are obtained through a flywheel I52 (Fig. 10) carried by the frame MI and the threaded axis I53 of which cooperates with a nut I54 rigid with the slider I39.

The relieving grindstone M (Figs. 5 and 8) is carried at the end of an axis adapted to rotate inside the bearing I55 under the action of a motor I58 as transmitted througha belt I51. The motor I59 and the bearing I55 are carried by a slider I59 which may be displaced through a slideway IBI through the usual means not illustrated controlled by a hand wheel I62. The slide- Way I6I is rigid with the plate I63 secured to the base plate I of the machine.

Lastly a control of any known type I64 which need not be described more fully allows sending current at the desired moments of the operating cycle of the machine to the motors 33, I21, 91 and H1. For the sake of simplicity I have merely shown on said controller and on the motors considered the starting points of the connections without illustrating the connections themselves. The controller, is started through a gear I55 engaging a'pinicn ISB (Fig. 9) to the axis of which is keyed a bevel wheel I61 meshing with the bevel 7 wheel I88 keyed to the shaft 84 driven by the motor 9|. 4

8 with the finishing grindstone M adapted to remove the material at the periphery of the drill As for the motors I48 and I58 controlling the grindstones M and M there is provided for them no connection with the controller as they are adapted to rotate in a continuous manner.

The operation of the machine is as follows:

The operator begins filling the gravity distributor II9-I2I with needles i8. Said needles sink inside the feed channel formed between the plates 9 and I2I. The crank plate I28 is then operated by hand for introducing the needles into the channel of the clamp drawing member I6. As they pass, the needles raise the spring urged hook I33 which holds them when the channel is full and the first needle is in its operative position in the clamp I5.

The operator, after he has cut the grindstone M to the desired flute shape and after having ground in proper parallelism with its axis the grindstone M, adjusts these two grindstones by placing them in a manner such as they may remove the amount of metal required. This being done he provides for the slope to be given to the grindstone M in relationship with the thread pitch to be obtained on the drill, by displacin in a suitable manner the screws I4 inside the circular groove I45 of the base plate I.

He sends then current into the grindstone controlling motors I49 and I58 and then into the motor 9I. The latter through the agency of the shaft 84, of the rod 82, of the arm 8i and of the shaft I8 rocks the sector 11. The stroke of the connecting rod 82 and the gear ratio between the sector 11 and the wheel I5 meshing therewith are selected in a manner such that for each revolution of the crank, the wheel may execute one revolution towards the right and one revolution towards the left. The wheel I5 through the shaft 66 and the gear wheels 65, 64 and 63 causes the shaft 62 to rotate. The reducing ratio is adjusted through the swing frame II for instance in a manner such that to'each revolution of the wheel 15 may correspond two revolutions of the wheel 63. The shaft 62 executes therefore two revolutions towards the right and two towards the left. The sunwheel 6I of the sun-and-planet system' which is keyed to the shaft 62 produces through the agency of the planet pinions 55 a rotation in opposite direction of the other sunwheel 63 which leads to a rotation of the shaft 52 and of the pinion 5|. The latter acts in its turn through the agency of the bevel wheels 5| and 49 on the sleeve 41 the rotation of which drives the spindle I3 and consequently the reproducer 38 which is screwed inside the nut 38 acting as a stationary nut. Thereby the reproducer advances helically with reference to the grindstone M which recesses the needle driven by the spindle and forms a helical flute therein. The conicity of the reproducer 36 cooperating with the roller IOI has for its action to slightly depress the cradle I, 8 and 9 as the needle progresses forwardly, which allows the obtention of a gradual reduction of the depth of the flute rearwardly.

When the drill is at the end of its stroke, as illustrated in Fig. 13, after recessing of the first gouge, the controller I64 sends current into the motor ill. The latter acts through the agency of the pinion N6, of the gear wheel I I5, of the shaft H3 and of the cam III acting on the bar II2 so as to depress the head cross-members (Fig. 11) and consequently the cradle whereby the drill is brought into operative relationship of the shaft 94 (Fig.

except forthat forming the ribs or fillets while the reproducer is unscrewed with reference to its nut 38 and returns into its original position by reason of the reversal in the direction of rotation of the shaft 52 and of the bevel wheel 5i.

At the end of this return movement, the controller I64 into the motor H1. The latter rotates in the opposite direction and the cam I II releases the bar 2 whereby thecradle returns into its upper position for which the ring 31 is again almost in contact with the roller I 8 I.

On the other hand the controller has sent current into the motor 91 which, through the agency 8) and of the gear wheel 93 causes a rotation of the wheel 56 with the cage 55 of the sun-and-planet system including the planet pinions 54 driving in their turn the sunwheel 53 of said system together with the shaft 52, the bevel wheels 5| and 49 and the spindle I3 which is screwed thus into the reproducer. If the gear ratios have been suitably chosen the spindle I3 executes thus a half revolution round its axis and the drill occupies the position required for recessing the second flute at of the former flute.

But obviously by providing such a half revolution of the spindle I3 and consequently of the reproducing sleeve, said spindle progresses through the length of a half pitch and if this diflerence were not corrected at the end of a few cuts, the reproducer would finally be screwed home inside the nut 38 and the machine would be locked.

This is corrected through the arrangement constituted by the pinion 92 keyed to the shaft 84 carrying also the pinion 93. The pinion 92 acting on the wheel 59 causes a rotation of the wheel 51 and of the bevel wheel 46, which leads to the rotation of thesleeve 4i, of the flange 42, of the socket 39 and of the nut 38. This constrains the spindle I3 to move backwards through a half pitch in compensation with the forward half pitch progress produced through the action of the sunand-planet system. The relative axial position of the reproducer 36 and of the nut 38 remains thus unaltered.

When returned into its rear starting position, the drill is urged forwardly again for recessing the second flute and for the formation of the fillet, the operation being the same as disclosed precedingly. Preferably the cycle begins over again twice more for the finishing of the two flutes, i. e., for the removing of the last unevennesses to be ground oil the flutes and the surface of the drill.

Lastly, when the last cut is finished and the cradle has returned into its upper position, the controller I64 sends current into the motor 33 which through the agency of the pinion 34, of the gear 35 and of the stress-limiting device 26, 21 causes the bevel wheels 24, 23 to rotate, which drives the gear wheel I9 (Fig. 13) and the nutshaped pinion I1. with reference to the cross member I2 urges rearwardly the clamp drawing member it which makes the clamp I5 recede and release the flnished drill, the latter is released and held then through the segments I 35 so that it can no longer be ejected until it is urged forwardly by the following needle is.

In the meantime, the controller I64 has sent current into the motor I21 which has begun r0- sends current of opposite direction tating and has urged forwardly through the agency oi the crank plate I26, of the connecting rod I25 and of the slider 123, the needle introducing piston I22 which urges a further needle inside the channel of the clamp drawing member it. The movement of the motor is stopped when the projection I26 meets the stop I29. The finished drill is ejected by the needle following it and which engages its operative position.

The controller I54 sends then current of pposite direction into the motor 33 which causes the clamp drawing member I6 and the clamp I to advance while looking the front needle in the position occupied by it.

The cycle of operation is then at an end and a further cycle may be begun.

My improved machine may produce drills of difierent sizes both as to diameter and to length. To this purpose it is possible to change the clamp t and the clamp drawing member it the cylindrical part of which latter may be more or less elongated so that its length ma be a predetermined multiple of the length of the needle, while its channel may receive a more or less considerable diameter. it is also possible to change the reproducer it and its nut lt together with the distributor which is adjustabl secured to the base plate in a manner such that it is possible to modify its position in accordance with the length of the clamp drawing member. Lastly it is also possible to change the needle introducing piston ill.

What i claim is:

i. it machine for producing drills starting from elongated members comprising a first grindstone adapted to recess the flutes in the elongated members, means for rotating same at a very high speed, a second grindstone for relieving the periphery oi the drills except in the vicinity of the flutes for forming ribs along same, means for imparting to an elongated member a combined movement longitudinally to and round its axis during operation with each grindstone in succession, along lines respectively oblique with reference to the axis of the grindstone and parallel with that of the relieving grindstone and means pivoted on a horizontal axis in the machine for transferring automatically the drills from the none of operation in which they lie along the first of above mentioned lines into the zone of operation or the second grindstone along the second mentioned line.

2. A machine for producing drills starting from elongated members comprising a first grindstone adapted to recess the flutes in the elongated members, means for rotating same at a very high speed, a second grindstone for relieving the periphery oi the drills except in the vicinity of the :dutes for forming ribs along same, means for imparting to an elongated member a combined movement longitudinally to and round its axis during operation with each grindstone in succession, along lines respectively oblique with reference to the axis of the first grindstone and parallel with that of the relieving grindstone and means pivoted on a horizontal axis in the machine ror transferring automatically the drills from the zone of operation in which they lie along the first of above mentioned lines into the zone of operation of the second grindstone along the second mentioned line, means for operating said transfer means at the end of the forward movement of the elongated members corresponding to the, recessing of the flutes and means whereby the second grindstone is operative dur- 10 log the return movement of the elongated members along the corresponding line.

3. A machine for producing drills starting from elongated members comprising a first grindstone adapted to recess the flutes in the elongated members, means for rotating same at a very high speed, a second grindstone for relieving the periphery of the drills except in the vicinity of the flutes for forming ribs along .same, means for imparting to an elongated member a combined movement longitudinally to and round its axis during operation with each grindstone in succession, along lines respectively oblique with reference to the axis of the first grindstone and parallel with that of the relieving grindstone and means pivoted on a horizontal axis in the machine for transferring automatically the drills from the zoneof operation in which they lie along the first of above mentioned lines into the zone of operation of the second grindstone along the second mentioned line and means for turning the elongated member after one reciprocation of the elongated member through round its axis.

4. A machine for producing drills starting from elongated members comprising a first grindstone adapted to recess the flutes in the elongated members, means for rotating same at a very high speed, a second grindstone for relieving the periphery of the drills except in the vicinity of the flutes for forming ribs along same, means for imparting to an elongated member a combined movement longitudinally to and round its axis during operation with each grindstone in suc-,

cession, along lines respectively oblique with reference to the axis of the first grindstone and parallelwith that of the relieving grindstone and means pivoted on a horizontal axis in the machine for transferring automatically the drills from the zone of operation in which they lie along the first of above mentioned lines into the zone of operation of the second grindstone along the second mentioned line and means for gradually moving the elongated member away from the first grindstone during operation of the latter for reducing gradually the depth of the recessed flute.

5. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow shaft facing said grindstone for retaining and releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by said first grindstone for relieving its surface the axis of said pivot being in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and translational movement with reference to the cradle.

6. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow shaft facing said grindstone for retaining and releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by said first grindstone for relieving its surface ,the axis of said pivot being in the same plane as the cradle pivot, a threaded reproducing member rigid with the hollow spindleand a nut cooperating therewith for imparting to the spindle and to at least the foremost elongated member in the spindle a rotary and translational movement for the recessing of the flutes.

7. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess gouges in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow shaft facing said grindstone for retaining and'releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by said first grindstone for relieving its surface the axis of said pivot being in the same plane as the cradle pivot, a threaded reproducing member rigid with the hollow spindle and a nut cooperating therewith for imparting to the spindle and to at least the foremost elongated member in the spindle a rotary and translational movement for the recessing of the flutes and means coaxial with the pivot of the cradle for giving the nut its rotation movement.

8. A machine for producing-drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed; a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow-shaft facing said grindstone for retaining and releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by said first grindstone for relieving its surface the axis of said pivot being in the same plane as the cradle pivot, a threaded reproducing member rigid with the hollow spindle and a nut cooperating therewith for imparting to the spindle and to at least the foremost elongated member in the spindle, a rotary and translational movement for the recessing of the flutes and means coaxial with the pivot of the cradle for giving the nut its rotative movement means for turning the elongated member after one reciprocation thereof through 180 round its axis and a differential interconnecting said means for giving the nut its rotation movement and said means for turning the elongated member through 180 and adapted to compensate for the progression of the spindle at each half revolution of the foremost elongated member.

9. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow shaft facing said grindstone for retaining and releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by-said first grindstone for relieving its surface the axis of said pivot being in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and translational movement with reference to the cradle, springs urging the cradle into a position of cooperation between the elongated member in the cradle and the first grindstone and means for locking the cradle in its other position corresponding to cooperation between said elongated member and the secondrelieving grindstone.

10. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, chuck members mounted at the end of said hollow shaft facing said grindstone for retaining and releasing the first one of said elongated members, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated members the flutes of which have been recessed by said first grindstone for relieving its surface the axis of said pivot being in the same plane as the cradle pivot, a reproducing member having a longitudinally conical surface rigid with the hollow spindle and a nut cooperating therewith for imparting to the spindle and to at least the foremost elongated member in the spindle a rotary and translational movement for the recessing of the flutes, springs adapted to urge the cradle in a given direction during the forward operative stroke of the spindle and a roller adjustably mounted on the machine and serving as a stop -for the cradle when urged by said springs.

11. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member therein, a clamp drawing member holding said clamp adapted to reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp drawing member, a cradle carrying said hollow spindle, a. horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the recessed spindle for relieving its surface and the axis of which is in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and translational movement with reference to the cradle.

12. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member therein, a clamp drawing member holding said clamp, adapted to, reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp drawing member, a gravity distributor adapted to feed the elongated members in succession into the channel inside the clamp-drawing member, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adaptedto engage therecessed spindle for relieving its surface and the axis of which is in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and translational movement with reference to the cradle.

13. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member therein, a clamp drawing member holding said clamp adapted to reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp-drawing member, a distributor for the elongated members comprising means for placing the elongated members in succession in front of said channel and means for pushing said elongated members into said channel for the flute recessing position of the cradle, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the recessed spindle for relieving its surface and the axis of which is in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and translational movement with reference to the cradle.

14. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess "flutes in the elongated members, means for rotating same at a very high speed; a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member therein, a clamp drawing member holding said clamp adapted to reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp drawing member, means for retaining the elongated member as soon as it is released by the clamp, means for ejecting the recessed elongated member from said retaining means through an impulse exerted by the next elongated member, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the recessed spindle for relieving its surface and the axis of which is in the same plane as the cradle pivot and means for applying to the hollow spindle a rotary and a translational movement with reference to the cradle.

15. A machine for producing drills starting from elongated members comprising a first grindstone adapted to recess the flutes in the elongated members, means for rotating same at a very high speed, a second grindstone for relieving the periphery of the drills except in the vicinity of the flutes for forming ribs along same, means for imparting to an elongated member a combined movement longitudinally to and round its axis during operation with each grindstone in succession, along lines respectively oblique with reference to the axis of the first grindstone and parallel with that of the relieving grindstone,

and means for adjusting the slope of the first recessing grindstone with reference to the direction of progress of the elongated members.

16. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member therein, a clamp drawing member holding said clamp adapted to reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp drawing member, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the recessed spindle for relieving its surface and the axis of which is in the same plane as the cradle pivot, means for applying to the hollow spindle a rotary and translational movement with reference to the cradle and means controlling the operation of the clamps and adapted to slide longitudinally over the cradle.

17. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess flutes in the elongated member, means for rotating same at a very high speed, a hollow spindle inside which the elongated members are adapted to move in succession, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second grindstone adapted to engage the elongated member the flutes of which have been recessed by said first grindstone for relieving its surface and the axis of which is in the same plane as the cradle pivot, a threaded interchangeable and removable reproducing member rigid with the hollow spindle and an interchangeable and removable nut cooperating therewith for imparting to the spindle and to at least the foremost elongated member in the spindle a rotary and translational movement for the recessing of the flutes.

18. A machine for producing drills starting from elongated members comprising a grindstone adapted to recess gouges in the elongated member, means for rotating same at a very high speed, a hollow spindle, a clamp inside said spindle adapted to cooperate with the nose of the spindle for holding the foremost elongated member herein, a clamp drawing member holding said clamp adapted to reciprocate inside said spindle and provided with a longitudinal channel inside which the elongated members are adapted to move, means for reciprocating said clamp drawing member, a first electric motor actuating said means, a cradle carrying said hollow spindle, a horizontal pivot round which said cradle is adapted to rock, a second electric motor for rocking said cradle, a second grindstone adapted to engage the elongated member the gouges of which have been recessed by said'first grindstone for relieving its surface and the axis of which is in the same plane as the cradle pivot, means for applying to the hollow spindle a rotary and translational movement with reference to the cradle, a third electric motor actuating said last means a distributor for feeding the elongated members into the longitudinal channel of said clamp drawing member, a fourth electric motor for actuating said distributor, means for turning the elongated member after one reciprocation of the elongated member through round its axis, a fourth electric motor for actuating said turning means, and a controller actuated by said third electric motor for controlling said other electric motors in due sequence.

EUGENE FOUQUET.

REFERENCES CITED The following references are of record in the file of this patent:

Number Number Great Britain May 3, 1917 

